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+
+//Initialisation of variables
+clc
+Z=1
+n=1
+m=9.11e-31//kg
+e=1.6e-19//coulomb
+o=8.85e-12//farad per metre
+h=6.625e-34//joule sec
+E=Z^2*m*e^4/(8*o^2*h^2*n^2)//relation 4.12
+printf('energy is %e joules \n',E)
+